Economy Airstones (Diffusers), 4" Diffusing Area, Blue

Product Code: AA4

The AA4 Economy Air Diffuser is an economical moulded air stone designed to provide dependable aeration for aquariums, fish hatcheries, hydroponic systems, laboratory tanks, and other small aquatic applications. Featuring a 4-inch diffusing area and a standard 3/16-inch barb inlet, the diffuser produces a steady stream of fine air bubbles that improve dissolved oxygen levels, water circulation, and overall aquatic health. Its simple, durable construction makes it an excellent choice for hobbyists, educators, hatcheries, and light-duty commercial applications.

Compatible with standard 3/16-inch air tubing, the AA4 installs quickly and operates with most aquarium and small pond air pumps. Its larger diffusing surface provides greater air distribution than shorter air stones, making it well suited for oxygenating fish tanks, bait tanks, hydroponic reservoirs, and laboratory aquaria.